To prepare a vanilla pumpkin pudding recipe, first you need to prepare the pumpkin. First, you will need the following ingredients: 12 cup pumpkin puree, 1 tablespoon vanilla extract, and 1 teaspoon salt. You will also need 1 cup of water. If you don't have any pumpkin, then you can use any other type of pumpkin you like. Place all of the ingredients except for the water in the saucepan. Bring the mixture to boil over medium-high heat, stirring constantly, until it thickens, about 10 minutes. Then, remove the pan from the heat and stir in 2 tablespoons of cold water to thin the pudding. Pour the vanilla pudding into the prepared pan and bake it for 40 to 45 minutes, or until the center is set and the top is golden brown.